2003 Nissan Altima Catalytic Converters
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Part Number: JN960327
Guaranteed to Fit
$231.78
Vehicle Fitment
- 2003 Nissan Altima S 6 Cyl 3.5L Manual Transaxle, No O2 Port
- 2003 Nissan Altima SL 6 Cyl 3.5L 4-Speed, Automatic Transaxle, No O2 Port
- 2003 Nissan Altima Base 6 Cyl 3.5L 4-Speed, Automatic Transaxle, No O2 Port
- 2003 Nissan Altima SE 6 Cyl 3.5L Manual Transaxle, No O2 Port
Product Details
Location : RearEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to CA, CO, NY or ME)Notes : 39.25 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold IndividuallyEPA : N/TB6000/64805NNGasket Included : With GasketOxygen Sensor Ports : Factory OE PortsOxygen Sensor Port Location : Factory OE LocationsWarranty : 1-year JC Whitney unlimited-mileage warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: JN960312
Guaranteed to Fit
$131.49
Vehicle Fitment
- 2003 Nissan Altima S 6 Cyl 3.5L 4-Speed, Automatic Transaxle, 1 O2 Port
- 2003 Nissan Altima SL 6 Cyl 3.5L 4-Speed, Automatic Transaxle, 1 O2 Port
- 2003 Nissan Altima Base 6 Cyl 3.5L Manual Transaxle, 1 O2 Port
- 2003 Nissan Altima SE 6 Cyl 3.5L 4-Speed, Automatic Transaxle, 1 O2 Port
Product Details
Location : Front, Driver SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to CA, CO, NY or ME)Notes : 13 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold IndividuallyEPA : N/TB6000/30407NNGasket Included : With GasketOxygen Sensor Ports : Factory OE PortsOxygen Sensor Port Location : Factory OE LocationsWarranty : 1-year JC Whitney unlimited-mileage warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: JN960332
Guaranteed to Fit
$203.99
Vehicle Fitment
- 2003 Nissan Altima SL 4 Cyl 2.5L
- 2003 Nissan Altima Base 4 Cyl 2.5L
- 2003 Nissan Altima S 4 Cyl 2.5L
Product Details
Location : RearEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to CA, CO, NY or ME)Notes : 40.5 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold IndividuallyEPA : N/TB6000/63005NNGasket Included : With GasketOxygen Sensor Ports : Factory OE PortsOxygen Sensor Port Location : Factory OE LocationsWarranty : 1-year JC Whitney unlimited-mileage warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: REPN960339
Guaranteed to Fit
$144.49
Vehicle Fitment
- 2003 Nissan Altima SL 4 Cyl 2.5L
- 2003 Nissan Altima Base 4 Cyl 2.5L
- 2003 Nissan Altima S 4 Cyl 2.5L
Product Details
Location : FrontEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to CA, CO, NY or ME)Notes : Manifold Converter; 19 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Manifold ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold IndividuallyEPA : N/CA/TWG/203-1302Gasket Included : With GasketOxygen Sensor Ports : Factory OE PortsOxygen Sensor Port Location : Factory OE LocationsWarranty : 5-year or 50,000-mile Evan Fischer limited warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: REPN960332
Guaranteed to Fit
$203.99
Vehicle Fitment
- 2003 Nissan Altima SL 4 Cyl 2.5L Undercar
- 2003 Nissan Altima Base 4 Cyl 2.5L Undercar
- 2003 Nissan Altima S 4 Cyl 2.5L Undercar
Product Details
Location : RearEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to CA, CO, NY or ME)Notes : 40.5 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold IndividuallyEPA : N/TB6000/63005NNGasket Included : With GasketOxygen Sensor Ports : Factory OE PortsOxygen Sensor Port Location : Factory OE LocationsWarranty : 5-year or 50,000-mile Evan Fischer limited warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: SET-REPN960339-2
Guaranteed to Fit
$330.99
Vehicle Fitment
- 2003 Nissan Altima SL 4 Cyl 2.5L Undercar
- 2003 Nissan Altima Base 4 Cyl 2.5L Undercar
- 2003 Nissan Altima S 4 Cyl 2.5L Undercar
Product Details
Location : Front And RearEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to CA, CO, NY or ME)Notes : Manifold ConverterComponents : (1) Front Manifold Catalytic Converter (1) Rear Catalytic ConverterRestricted States : California|Colorado|New York|MaineType : Front - Manifold Converter; Rear - Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Set of 2Gasket Included : With GasketOxygen Sensor Ports : Factory OE PortsOxygen Sensor Port Location : Factory OE LocationsWarranty : 5-year or 50,000-mile Evan Fischer limited warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: REPN960312
Guaranteed to Fit
$131.49
Vehicle Fitment
- 2003 Nissan Altima SE 6 Cyl 3.5L Manual Transaxle, Radiator Side, Precat
- 2003 Nissan Altima S 6 Cyl 3.5L 4-Speed, Automatic Transaxle, Radiator Side, Precat
- 2003 Nissan Altima SL 6 Cyl 3.5L 4-Speed, Automatic Transaxle, Radiator Side, Precat
- 2003 Nissan Altima Base 6 Cyl 3.5L Manual Transaxle, Radiator Side, Precat
Product Details
Location : Front, Driver SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to CA, CO, NY or ME)Notes : 13 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold IndividuallyEPA : N/TB6000/30407NNGasket Included : With GasketOxygen Sensor Ports : Factory OE PortsOxygen Sensor Port Location : Factory OE LocationsWarranty : 5-year or 50,000-mile Evan Fischer limited warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: SET-REPN960312-3
Guaranteed to Fit
$459.99
Vehicle Fitment
- 2003 Nissan Altima SE 6 Cyl 3.5L 4-Speed, Automatic Transaxle, Radiator Side, Precat
- 2003 Nissan Altima S 6 Cyl 3.5L 4-Speed, Automatic Transaxle, Radiator Side, Precat
- 2003 Nissan Altima SL 6 Cyl 3.5L 4-Speed, Automatic Transaxle, Radiator Side, Precat
- 2003 Nissan Altima Base 6 Cyl 3.5L 4-Speed, Automatic Transaxle, Radiator Side, Precat
Product Details
Location : Front and Rear, Driver and Passenger SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to CA, CO, NY or ME)Components : (1) Firewall Side Catalytic Converter, (1) Radiator Side Catalytic ConverterRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Set of 3Gasket Included : Firewall Side - Without Gasket; Rear - With GasketOxygen Sensor Ports : Factory OE PortsOxygen Sensor Port Location : Factory OE LocationsWarranty : 5-year or 50,000-mile Evan Fischer limited warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: SET-REPN960325-2
Guaranteed to Fit
$267.99
Vehicle Fitment
- 2003 Nissan Altima SE 6 Cyl 3.5L 4-Speed, Automatic Transaxle, Radiator Side, Precat
- 2003 Nissan Altima S 6 Cyl 3.5L 4-Speed, Automatic Transaxle, Radiator Side, Precat
- 2003 Nissan Altima SL 6 Cyl 3.5L 4-Speed, Automatic Transaxle, Radiator Side, Precat
- 2003 Nissan Altima Base 6 Cyl 3.5L 4-Speed, Automatic Transaxle, Radiator Side, Precat
Product Details
Location : Front, Driver and Passenger SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to CA, CO, NY or ME)Components : (1) Firewall Side Catalytic Converter, (1) Radiator Side Catalytic ConverterRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Set of 2Gasket Included : With GasketOxygen Sensor Ports : Factory OE PortsOxygen Sensor Port Location : Factory OE LocationsWarranty : 5-year or 50,000-mile Evan Fischer limited warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: REPN960327
Guaranteed to Fit
$201.99
Vehicle Fitment
- 2003 Nissan Altima S 6 Cyl 3.5L Manual Transaxle, Undercar
- 2003 Nissan Altima SL 6 Cyl 3.5L 4-Speed, Automatic Transaxle, Undercar
- 2003 Nissan Altima Base 6 Cyl 3.5L 4-Speed, Automatic Transaxle, Undercar
- 2003 Nissan Altima SE 6 Cyl 3.5L Manual Transaxle, Undercar
Product Details
Location : RearEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to CA, CO, NY or ME)Notes : 39.25 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold IndividuallyEPA : N/TB6000/64805NNGasket Included : With GasketOxygen Sensor Ports : Factory OE PortsOxygen Sensor Port Location : Factory OE LocationsWarranty : 5-year or 50,000-mile Evan Fischer limited warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: SET-REPN960327-2
Guaranteed to Fit
$334.99
Vehicle Fitment
- 2003 Nissan Altima SE 6 Cyl 3.5L 4-Speed, Automatic Transaxle, Firewall Side, Precat
- 2003 Nissan Altima S 6 Cyl 3.5L 4-Speed, Automatic Transaxle, Firewall Side, Precat
- 2003 Nissan Altima SL 6 Cyl 3.5L 4-Speed, Automatic Transaxle, Firewall Side, Precat
- 2003 Nissan Altima Base 6 Cyl 3.5L 4-Speed, Automatic Transaxle, Firewall Side, Precat
Product Details
Location : Front and Rear, Passenger SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to CA, CO, NY or ME)Components : (1) Catalytic Converter, (1) Front Firewall Side Catalytic ConverterRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Set of 2Gasket Included : With GasketOxygen Sensor Ports : Factory OE PortsOxygen Sensor Port Location : Factory OE LocationsWarranty : 5-year or 50,000-mile Evan Fischer limited warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: REPN960325
Guaranteed to Fit
$150.99
Vehicle Fitment
- 2003 Nissan Altima SE 6 Cyl 3.5L Manual Transaxle, Firewall Side, Precat
- 2003 Nissan Altima S 6 Cyl 3.5L Manual Transaxle, Firewall Side, Precat
- 2003 Nissan Altima SL 6 Cyl 3.5L 4-Speed, Automatic Transaxle, Firewall Side, Precat
- 2003 Nissan Altima Base 6 Cyl 3.5L Manual Transaxle, Firewall Side, Precat
Product Details
Location : Front, Passenger SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to CA, CO, NY or ME)Notes : 14 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold IndividuallyEPA : N/TB6000/501-430Gasket Included : Without GasketOxygen Sensor Ports : Factory OE PortsOxygen Sensor Port Location : Factory OE LocationsWarranty : 5-year or 50,000-mile Evan Fischer limited warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: KIT-070324-R029
Guaranteed to Fit
$249.99
Vehicle Fitment
- 2003 Nissan Altima Base 4 Cyl 2.5L Undercar
- 2003 Nissan Altima SL 4 Cyl 2.5L Undercar
- 2003 Nissan Altima S 4 Cyl 2.5L Undercar
Product Details
Location : After Secondary Catalytic ConverterEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to CA, CO, NY or ME)Components : (1) Catalytic Converter and (1) Oxygen SensorRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : 2-Piece KitEPA : N/TB6000/63005NNGasket Included : With GasketOxygen Sensor Ports : Factory OE PortsOxygen Sensor Port Location : Factory OE LocationsWarranty : 1-year JC Whitney unlimited-mileage warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: M6651206
Guaranteed to Fit
$194.00
Vehicle Fitment
- 2003 Nissan Altima SE 6 Cyl 3.5L
- 2003 Nissan Altima Base 6 Cyl 3.5L
- 2003 Nissan Altima S 6 Cyl 3.5L
- 2003 Nissan Altima SL 6 Cyl 3.5L
Product Details
Location : RearEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to CA, CO, NY or ME)Notes : 13.75 in. L x 5 in. W x 4.75 in. HRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Semi-Universal (Welding Required)Recommended Use : OE ReplacementQuantity Sold : Sold IndividuallyGasket Included : Without GasketWarranty : Magnaflow 5 year / 50,000 Mile Limited WarrantyReturns Policy : NON-RETURNABLEProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: M6699205HM
Guaranteed to Fit
$178.00
Vehicle Fitment
- 2003 Nissan Altima SL 4 Cyl 2.5L
- 2003 Nissan Altima Base 4 Cyl 2.5L
- 2003 Nissan Altima S 4 Cyl 2.5L
Product Details
Emissions : Federal EPA Standard, 46-State Legal (Cannot ship to CA, CO, NY or ME)Notes : 2.25 in. Inlet/Outlet; 13 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Semi-Universal (Welding Required)Recommended Use : OE ReplacementQuantity Sold : Sold IndividuallyGasket Included : Without GasketWarranty : Lifetime Magnaflow Limited WarrantyReturns Policy : NON-RETURNABLEProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
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Helpful Automotive Resources
P0430 Code: Catalyst System Efficiency Below Threshold (Bank 2)In most cases, a vehicle with an inefficient catalytic converter will continue to run just fine. But if the converter is obstructed internally, it can cause poor engine performance and may even damage the engine in the long run.
P0042 Code: HO2S Heater Control Circuit Bank 1 Sensor 3Bank 1 is the side of the engine where the #1 cylinder is located. P0042 code is set when your car’s PCM determines a potential problem with the heater element circuit of the oxygen sensor.
Can You Drive Without a Catalytic Converter?Technically, yes. Older cars ran just fine before catalytic converters became commonplace in the 1970s. So, if your question is whether your car will run without one, then it most certainly will. But the other question you should be asking is—should you risk it?
Removing or disabling the catalytic converter could
P0316 Code: Engine Misfire Detected on Startup (First 1000 Revolutions)The PCM may disable the misfiring cylinder or cylinders in order to prevent further damage to the engine. Code P0316 is often listed in addition to one or more of the P0300 series codes that are associated with the misfiring cylinder/s.
P0134: O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 1)The Bank 1 portion of the code refers to the side of the engine with the number one cylinder. Sensor 1 refers to the upstream O2 sensor.
How to Tell If the Catalytic Converter is CloggedA clogged catalytic converter will present symptoms, while a chemically failed cat con that’s not clogged typically just illuminates the check engine light or malfunction indicator lamp (MIL). Also, if the cat con that just fails chemically but doesn’t clog is not the light-off cat con (the cat con closest